当前位置: X-MOL 学术Polym. Eng. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fracture and Orientation of Long‐Glass‐Fiber‐Reinforced Polypropylene During Injection Molding
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2019-11-01 , DOI: 10.1002/pen.25254
Xu‐Qin Hou 1 , Xing‐Yuan Chen 1 , Bao‐Chen Liu 1 , Sheng‐Chao Chen 1 , Hai‐Mei Li 1 , Wei Cao 2
Affiliation  

Injection processing parameters directly influence the final fiber length and may have a negative effect on the mechanical properties of a part. The aim of the work is to investigate and quantify the effects of the injection rate (2/10/50 cm3/s) on the fiber length, the distribution, and orientation during injection molding and the mechanical properties of long‐glass‐fiber‐reinforced polypropylene (LGF/PP) by experimental and simulated methods. When the injection rate increases from 2 to 10 cm3/s, the fiber length sharply decreases from the original 11 mm to 3.43 mm at the nozzle and 1.30 mm at the filling end, and almost 88% of the fibers are less than 3 mm when the injection rate is 50 cm3/s. A distinct hierarchical orientation (skin‐shear‐core) for the fiber distribution in the thickness is obtained via a metallographic microscope, which shows that the shear layer (here the shear stress is larger and the fiber is more inclined to oriented along the flow direction) decreases with increasing injection rate. Moreover, the numerical results of the residual fiber length and orientation at different injection rates are in accord with the trend of the measured results. POLYM. ENG. SCI., 60:13–21, 2020. © 2019 Society of Plastics Engineers

中文翻译:

长玻璃纤维增​​强聚丙烯在注塑过程中的断裂和取向

注射加工参数直接影响最终的纤维长度,并且可能对零件的机械性能产生负面影响。该工作的目的是研究和量化注射速率(2/10/50 cm 3 / s)对注射成型过程中纤维长度,分布和取向以及长玻璃纤维的机械性能的影响。通过实验和模拟方法增强聚丙烯(LGF / PP)。当注射速率从2增加到10 cm 3 / s时,纤维长度从喷嘴的原始11 mm急剧减少到喷嘴的3.43 mm,填充端的长度从1.30 mm减少,几乎88%的纤维小于3 mm当注射速率为50 cm 3时/ s。通过金相显微镜获得了厚度方向上纤维分布的明显分层取向(皮肤-剪切-芯),这表明剪切层(此处的剪切应力更大,纤维更倾向于沿流动方向取向) )随着注射速率的增加而降低。此外,在不同注入速率下残余纤维长度和取向的数值结果与测量结果的趋势一致。POLYM。ENG。SCI。,60:13–21,2020.©2019塑料工程师协会
更新日期:2019-11-01
down
wechat
bug